 /*******************************************************************************
  * Copyright (c) 2004, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.commands;

 /**
  * An instance of this interface can be used by clients to receive notification
  * of changes to one or more instances of <code>IHandler</code>.
  * <p>
  * This interface may be implemented by clients.
  * </p>
  *
  * @since 3.1
  * @see IHandler#addHandlerListener(IHandlerListener)
  * @see IHandler#removeHandlerListener(IHandlerListener)
  */
 public interface IHandlerListener {

     /**
      * Notifies that one or more properties of an instance of
      * <code>IHandler</code> have changed. Specific details are described in
      * the <code>HandlerEvent</code>.
      *
      * @param handlerEvent
      * the handler event. Guaranteed not to be <code>null</code>.
      */
     void handlerChanged(HandlerEvent handlerEvent);
 }

